Machineguntony
New member
I decided to increase shoulder bump on my 308 rounds. I was trying to make them run flawlessly in my M-60 and bolt action.
I increased the shoulder bump to the point that the finished round was lower than the first step of a Lyman case gauge. Here is a pic...
https://imgur.com/a/sEuXRsB
The round plunked perfectly into the chamber of the M-60 and cycled effortlessly in a bolt action.
I use exclusively LC 308 brass. I can usually get about 5 reloads (done by me) per case before I notice broken cases.
This time, I got a broken case every 20 or so rounds, and it was only the 2nd loading done by me. All the broken cases came from the M-60. There were no broken cases in the bolt action.
Do you think the increased shoulder bump was the cause of all the broke cases?
Does too much shoulder bump weaken the brass?
I increased the shoulder bump to the point that the finished round was lower than the first step of a Lyman case gauge. Here is a pic...
https://imgur.com/a/sEuXRsB
The round plunked perfectly into the chamber of the M-60 and cycled effortlessly in a bolt action.
I use exclusively LC 308 brass. I can usually get about 5 reloads (done by me) per case before I notice broken cases.
This time, I got a broken case every 20 or so rounds, and it was only the 2nd loading done by me. All the broken cases came from the M-60. There were no broken cases in the bolt action.
Do you think the increased shoulder bump was the cause of all the broke cases?
Does too much shoulder bump weaken the brass?